fifteen-year-olds是什么意思?

fifteen-year-olds是什么意思? fifteen-year-olds看做单数还是复数? Fifteen-year-olds shouldn't be allowed to drink.(改为同义句）____ ___ ____fifteen-year-olds to drin 初三英语语法题Do you think () should be allowed to drive?A.sixteen-year-old.B.seventeen-year-olds.C.fifteen-year-old.D.eighteen-years-olds five-six-year olds是什么意思与five six-year olds的区别是什么 Many parents don't allow their ----to go out at night.A fifteen years old B fifteen-year-old C fifteen-year-olds D fifteen-years-old选择什么?为什么? seven-year-olds Twelve-Year-Olds翻译 three-year-olds汉语意思 year olds还是years old? sixteen year olds 还是sixteen year old? eleven-year-olds跟eleven-year-old的音标分别是什么?谢eleven-year-olds跟eleven-year-old这是我在英语书上看到的,烦请哪位知情人士告知音标. fifteen-year-olds和a fifteen-year-old boy前者是指所有十五岁的青少年后者是指一个十五岁的男孩 后者如果把横线去掉是不是要变成a fifteen years old boy?那前者去掉横线呢? 为什么six-year-olds 是正确的 什么情况下用five-year-olds? sixteen-year-olds能做主语吗? sixteen-year-olds 这种表达正确么? sixteen-year-olds单数还是负数